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    Wyświetlanie 1-7 z 7
    Tytuł:
    Structural and optical properties evolution of ‘fused’ multilayer Nano PbS thin films deposited by chemical bath deposition
    Autorzy:
    Mous, A. M.
    Al-Jawad, S. M.
    Al-Shammari, S. M. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/971317.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Nano PbS
    fused multilayer
    XRD
    CBD
    Opis:
    Here, we report the unusual behavior shown by the PbS samples prepared using a multilayer deposition approach by chemical solution deposition method. Thin samples were prepared by depositing several films at different deposition conditions on glass substrates. X-ray diffraction showed that final multilayer samples showed a peculiar variation. Even when they showed well defined structure the intensities of the peaks do not correspond to those of the initial films.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2014, 6; 16-25
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of deposition parameters on kinematics growth and optical properties of PbS nano films deposited by chemical bath deposition
    Autorzy:
    Mousa, A. M.
    Hassen, S. M.
    Mohmoed, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/412201.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    nanofilm
    chemical bath deposition
    PbS films
    Opis:
    The paper presents a study regarding the kinetic of chemical bath deposition (CBD) PbS nano films. Nano films were deposited from chemical bath containing thiourea, lead nitrite, and ammonia. The deposition kinematics and optical investigations have been performed to compare the properties of the films grown with different precursor solutions. We are able to determine the growth rate as a function of the synthesis conditions and it was found that the growth rate of deposited nano layer affected significantly by synthesis conditions. The main characteristic of nano films is the band gap. This parameter determined from spectroscopy Measurements of transmission, in the energy range of 240-840 nm is influenced by many factors such as deposition time, bath temperature, pH value of the path and molar concentration of the reactants.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2014, 15; 1-10
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure and dynamics of a public bike-sharing system. Case study of the public transport system in Białystok
    Autorzy:
    Dobrzyńska, E.
    Dobrzyński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/398895.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    public bike-sharing system (PBS)
    network dynamics
    network analysis
    publiczny system rowerów publicznych (PBS)
    dynamika sieci
    analiza sieci
    Opis:
    The article presents the results of a research project referring to the dynamics of the public bike-sharing system BiKeR (Białystok, Poland) in 2014-2015. Identification of the dynamics of the system permits modifications that lead to the enhancement of the efficiency and help to determine the reasons for the choice of a location for new bicycle stations. The basic methodology used for compiling data were the statistical methods with special emphasis on network analysis and graph theory. Analysis of the data allowed us to identify the mechanisms of changes in the system affecting its dynamics, especially in the area of network topology changes in conjunction with the location of network nodes (stations). The research and analysis showed the specificity of PBS as a transport network. The PBS network, the process of analysis, the value of network metrics and their distribution differ significantly from other types of transport networks (including municipal). The results improve decision-making processes related to the creation and modification of a PBS network, especially in the field of process support, the choice of station location and the impact of these choices on the networks dynamics (as a prognostic utility).
    Źródło:
    Ekonomia i Zarządzanie; 2016, 8, 4; 59-66
    2080-9646
    Pojawia się w:
    Ekonomia i Zarządzanie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A polarization selective beam splitter based on a subwavelength multisubpart profile grating structure
    Autorzy:
    Xiao, Y.
    Huang, L.
    Wu, H.
    Sun, X.
    Xiao, W.
    Duan, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/174760.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    diffraction and gratings
    polarizing beam splitter
    PBS
    leaky-mode resonance
    LMR
    Opis:
    In this study, a polarization selective beam splitter constructed by only a single layer subwavelength multisubpart profile grating is presented. Rigorous coupled-wave analysis is adopted to investigate the properties of the structure. It is shown that for a transverse electric polarized wave, the device demonstrates very high reflectivity (>97%) from 1.46 to 1.58 μm; and for a transverse magnetic polarized wave, at the wavelength of 1.55 μm, it exhibits about 50/50 beam ratio under normal incidence. To evaluate the response of the polarizing beam splitters under variation in structure parameters, we also investigated the fabrication tolerances of the device.
    Źródło:
    Optica Applicata; 2016, 46, 4; 665-672
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Corrosion behaviour of polished and sandblasted titanium alloys in PBS solution
    Autorzy:
    Burnat, B.
    Walkowiak-Przybyło, M.
    Błaszczyk, T.
    Klimek, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/306724.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    corrosion
    PBS solution
    polishing
    sandblasting
    titanium alloys
    korozja
    stop tytanu
    piaskowanie
    Opis:
    In this work, we performed comparative studies of the effect of surface preparation of Ti6Al4V and Ti6Al7Nb biomedical alloys and the influence of endothelial cells on their corrosion behaviour in PBS (Phosphate Buffered Saline). Two different methods of surface modification were applied – polishing and sandblasting. The polished Ti6Al7Nb alloy was found to have the best resistance against general corrosion in PBS. It was characterized by the lowest corrosion rate, the widest passive range and the lowest reactivity. Both alloys prepared by sandblasting exhibited worse corrosion properties in comparison to the polished ones. This can be associated with a greater development of their surface and the presence of Al2O3 grains which caused an increase of corrosion potential but might also influence the weakening of the passive layer. Results of potentiodynamic anodic polarization indicated that more resistant to pitting corrosion was Ti6Al7Nb alloy regardless of the method of surface preparation. In those cases, anodic polarization caused only an increase of passive layer, while in the case of sandblasted Ti6Al4V alloy it caused a pitting corrosion. The results obtained allowed us to conclude that the niobium-titanium alloys had higher corrosion resistance than titanium alloys with vanadium. Moreover, it was stated that endothelial cells improved the corrosion resistance of all the titanium alloys examined.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2013, 15, 1; 87-94
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Evolution of a High Productivity Urban e-Commerce Delivery Vehicle using Australian Performance Based Standards
    Autorzy:
    Hassall, Kim
    Thomson, Russell
    Cowell, Ken
    Powiązania:
    https://bibliotekanauki.pl/articles/503916.pdf
    Data publikacji:
    2019
    Wydawca:
    Międzynarodowa Wyższa Szkoła Logistyki i Transportu
    Tematy:
    Urban Logistics
    High Productivity Vehicles
    Performance Based Standards
    Freight Productivity
    New Rigid PBS Truck
    innovative urban deliveries
    Opis:
    The introduction of High Productivity Vehicles (HPVs) in Australia, through the Performance Based Standards (PBS) scheme, was predicated on new mechanical engineering standards that were mandated especially for these new vehicles. These standards improved vehicle stability, general performance and safety, especially safety. Two national surveys showed both massive safety and productivity benefits compared to conventional Australian road freight fleets. The first Australian PBS vehicles operated under permits from 1997 but the formalized Australian scheme was implemented in 2006. So arguably the introduction of HPVs under permit and now under a formal regulatory PBS framework has allowed some 20 years of research observations. However, only one major type of single rigid, high productivity truck, without a trailer, has been active in an urban environment as a pilot, over that time. This paper examines this special urban High Productivity Vehicle which could be exceptionally useful for the urban freight task in many countries should they ever adopt it.
    Źródło:
    Logistics and Transport; 2019, 43, 3; 73-80
    1734-2015
    Pojawia się w:
    Logistics and Transport
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Quantum dots for temperature sensing
    Autorzy:
    Doskaliuk, Natalia
    Lukan, Yuliana
    Khalavka, Yuriy
    Powiązania:
    https://bibliotekanauki.pl/articles/35139207.pdf
    Data publikacji:
    2023
    Wydawca:
    Radomskie Towarzystwo Naukowe
    Tematy:
    quantum dots
    photoluminescence
    thermal sensing
    temperature sensitivity
    II-VI semiconductors
    I-III-VI semiconductors
    CdTe
    CdS
    PbS
    AgInS2
    CuInS2
    kropki kwantowe
    fotoluminescencja
    detekcja ciepła
    wrażliwość termiczna
    półprzewodniki II-VI
    półprzewodniki I-III-VI
    Opis:
    Quantum dots are three-dimensional nanoparticles of semiconductors with typical sizes ranging from 2 to 10 nm. Due to the quantum confinement effect the energy gap increase with the size decreasing resulting in size-depended and fine-tunable optical characteristics. Besides this, the energy structure of a quantum dot with a certain size is highly sensitive to environmental conditions. These specific properties open a wide range of applications starting from optical and optoelectronic devices and ending with biosensing and life science. Temperature is one of those parameters influencing strongly on the optical properties of semiconductor nanocrystals, which make them promising materials for temperature sensing, more often using a fluorescent response. Compared to the conventional organic dyes already applied in this field, quantum dots exhibit a set of advantages, such as high quantum yield and photostability, long fluorescence lifetime, higher Stokes shift, and ability to surface functionalization with targeted organic molecules aimed to provide them biocompatibility. In this review, we briefly discuss the properties of II-VI and assumingly less toxic I-III-VI quantum dots, mechanisms of temperature-induced fluorescence response, and the feasibility of their practical application in the field of thermal sensing.
    Źródło:
    Scientiae Radices; 2023, 2, 2; 93-111
    2956-4808
    Pojawia się w:
    Scientiae Radices
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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